81473523 has 4 divisors (see below), whose sum is σ = 108631368. Its totient is φ = 54315680.

The previous prime is 81473479. The next prime is 81473551. The reversal of 81473523 is 32537418.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81473523 - 2⁹ = 81473011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81473323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13578918 + ... + 13578923.

It is an arithmetic number, because the mean of its divisors is an integer number (27157842).

Almost surely, 2^81473523 is an apocalyptic number.

81473523 is a deficient number, since it is larger than the sum of its proper divisors (27157845).

81473523 is a wasteful number, since it uses less digits than its factorization.

81473523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27157844.

The product of its digits is 20160, while the sum is 33.

The square root of 81473523 is about 9026.2684981115. The cubic root of 81473523 is about 433.5163671884.

The spelling of 81473523 in words is "eighty-one million, four hundred seventy-three thousand, five hundred twenty-three".